Issues with closing an entity object

Two sub issues here.
1. If closeAsync or close throws an exception, it still leaves the object in closing state. If we call close again, it will not do anything as object is already in closing state.
2. When a SubscriptionClient like object is being closed, it will close multiple internal objects one after the other. A failure or exception in closing one of those internal objects will not close subsequent objects in the close order.